package com.sky.aspect;

import com.sky.annotation.AutoFile;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充
 */
@Aspect
@Component
@Slf4j
public class AutoFileAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFile)")
    public void autoFilePointCut(){}

    /**
     * 前置通知
     */
    @Before("autoFilePointCut()")
    public void autoFile(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充...");
        //获取拦截到的方法是INSERT操作还是UPDATE操作
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();  //方法签名对象
        AutoFile autoFile = signature.getMethod().getAnnotation(AutoFile.class); //获取方法上的注解对象
        OperationType operationType = autoFile.value(); //获取数据库操作类型
        //获取当前被拦截方法的参数-----实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];  //获取实体对象，约定实体类放在形参列表第一个
        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //对实体对象进行赋值
        if (operationType == OperationType.INSERT) {
            try {
                Method setCreateTime = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreatUser = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射进行赋值
                setCreateTime.invoke(entity,now);
                setCreatUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射进行赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
